Quote Originally Posted by miko101130 View Post
higher viscosity rating like 50 and 60 re suited for two kinds of engine...
1. poorly maintained vehicles with low compression and is consuming oils.
2. racing engines (redline has 10w60 0r 15w60 i think, same with other racing oils)... Due to the fact that this oils are use for TRACK days and LAPPING around a circuit which an engine is driven at redline on the tachometer most of the time.... which i don't think your engines are capable and even built to do.

If you want to conserve fuel use a 0w-5w to starting viscosity and a 40 operating viscosity
if you want better protection at stop and go traffic during summer use 10w to 15w starting viscosity and 40 operating viscosity
The very reason why I mentioned the higher viscosity rating is because of the possibility that his bearings may already have clearances that are above factory specs.


Being in a tropical climate, one cannot really use the lower Winter viscosity rating numbers of multigrade oil since those behave at the said W numbers only at 32 degrees farenheit and below so no difference really in using 0w/5w/10w here. However, it is still noted that multigrade oils will have a lower viscosity rating (but definitely not near their W values) than its operating temp values which is very helpful in cold engine starts even in tropical ambient temps. The very reason why 20w-40 (20w-50 for older engines with possible larger bearing clearances) multigrade oil is generally ok for our climate considering the price difference of multigrade oils with lower winter grades.